Sorry to hear about your flickering issues, what kind of cells are you using? Also, not sure if you've seen
this thread.
As for L6 vs. L5, again, our eyes do not perceive light in a linear fashion thus it wouldn't appear that big a difference. At 30 seconds for each, I had previously measured 3020lms on L6 and 1830lms on L5.
Here is L6 and L5 side-by-side:
While there is a distinct difference, to my eyes, L6 doesn't seem to look 65% brighter vs. L5 as suggested by the lumens measurments. To me, it's more like 25-30% at best.
In real-life it's even harder for your eyes to pick this up as there are a few factors that may be potentially conspiring to lessen the differences:
- L6 has a quick soft-ramp so it doesn't instantly go full blast immediately but rather it'll ramp to full output within a second. Due to this soft-ramp, the transition isn't abrupt but somewhat "gradual" between L5 and L6. It'll actually black out temporarily thus when switching back and forth, this may be lessening the visual transition between L5 to L6
- there's ~200lms step down just after the first minute further tightening the gap between L5 to L6
- the TN30 isn't well regulated on L6 but is on L5 thus when running on L6 output is constantly dropping but is steady on L5
Here is a three minute runtime that I captued on my light meter just now on freshly charged cells:
- I first turned it on in L6 until it stepped down just after a minute then dropped it to L5 and left it there for nearly 30 seconds (but notice how it's actually stable and in fact creeping up a little on L5)
- Then I flipped it back to L6 and left it there for approx. 15 seconds (again, note how output is subtly dropping) and then switched to L5 for a few seconds
- Next the series of peaks/troughs you see are constant flips between L6 to L5 and back but note how it'll actually dip down below 1200lms before ramping up to full output. This is where I think the gradual (even if transitioned over a second) is further lessing the effect of the visual transitions between L6/L5
It could very well be that your particular TN30 has a distinct defect where L6/L5 are not spaced far enough apart but I have a feeling that even on your replacement, you'll still be hard pressed to notice the "stated on-paper" difference between L6 to L5. This has been a common complaint with the TN30 and is a factor that manufacturer's should take into account when spacing the output levels since again, our eyes do not perceive differences in brightness in accordance to what's on paper.
Hope that helps and best of luck w/your TN30.
Cheers,
Tim